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Contents

MPAII Installation and Operations Manual Page iii

Introduction

Warranty Registration

Unpacking

Features and Benefits

Applications

Audioconferencing and Videoconferencing

Courtrooms and Public Meetings

Distance Learning

Hotels and Government Meetings

Houses of Worship

Talk Shows

Product Description

MPAII

Front-Panel Controls

Back-Panel Connectors

Before You Install

Room Planning

Microphone Selection

Microphone Placement

Power Requirements

PC Option

Auxiliary Equipment

Equipment Placement

Environmental Requirements

Installation

Completed Installation

Step 1 — Voltage Input Selection

Step 2 — Back-Panel Connections

Step 3 — Phantom Power Configuration

Step 4 — Auto Mix Switches

Step 5 — Baud Rate

Step 6 — Setting Levels

Program Setup

Factory Default Programs

User-Configuration Programs

Default Program Description

Custom Programming

Running the MPAII Programmming Software

Understanding the Main Screen

Programming Functions

Program Parameters

Specifications

Warranty

FCC Part 15 Compliance

Safety Information

Appendix A: Glossary

Appendix B: Connector Pinouts

Appendix C: Programming Tutorial

Appendix D: Applications

Appendix E: MPAII Block Diagram

Appendix F: Schematics

Technical or Setup Assistance

Telephone: 800.945.7730 (USA) or 801.975.7200 (worldwide) • Worldwide Web @ http://www.gentner.com

Summary of Contents for MPAII

Page 1: ...MPAII Installation and Operations Manual ...

Page 2: ... and Operations Manual Gentner Part No 800 111 001 Rev 2 00 January 1997 Manual Development Bill Kilpack Artwork and Illustrations Mike Greenhalgh Bill Kilpack Copyright Information Gentner Communications Corporation is committed to protecting the environment and preserving our natural resources This manual has been printed entirely on recycled paper This equipment complies with the requirements o...

Page 3: ...ation 10 Step 1 Voltage Input Selection 10 Step 2 Back Panel Connections 11 Step 3 Phantom Power Configuration 12 Step 4 Auto Mix Switches 13 Step 5 Baud Rate 13 Step 6 Setting Levels 13 Program Setup 14 Factory Default Programs 14 User Configuration Programs 14 Default Program Description 15 Custom Programming 17 Running the MPAII Programmming Software 17 Understanding the Main Screen 18 Programm...

Page 4: ... auxiliary input output RCA connector 12 Figure 19 MPAII phantom power dip switches 12 Figure 20 MPAII front panel controls 13 Figure 21 MPAII auto mix switches 13 Figure 22 MPAII baud rate dip switches 13 Figure 23 MPAII control norm position 13 Figure 24 MPAII front panel controls 14 Figure 25 MPAII programming software title screen 18 Figure 26 MPAII programming software main screen 18 Figure 2...

Page 5: ...entner Communications Corporation at the location noted below We welcome and encourage your comments so we can continue to improve our products and serve your teleconferencing needs Gentner Communications Corporation 1825 Research Way Salt Lake City Utah 84119 TEL Worldwide 801 975 7200 In U S A 800 945 7730 FAX Worldwide 801 977 0087 In U S A 800 933 5107 FAX On Demand 24 Hour Information line 80...

Page 6: ...conferencing and Videoconferencing The MPAII s design makes the equipment particularly useful in audioconferencing and videoconferencing applications where quality audio is a must With the logic output it is possible to connect the MPAII to cameras electronic signs and other equipment that can be controlled electronically Courtrooms and Public Meetings Courtrooms city councils and other public mee...

Page 7: ...he MPAII is an automatic microphone mixer the most advanced type of mixer For explanations of non gating and gating types see Appendix A Page 28 The MPAII is especially well suited to overcoming excessive room noise reverberation and other problems associated with multi microphone installations The gain mixing level of each microphone is automatically adjusted based on audio levels The MPAII monit...

Page 8: ...io presence and lights red to indicate audio peaks 4 PA Level LED This LED indicates the level of audio being received from the PA INPUT The LED lights green with normal audio presence and lights red to indicate audio peaks 5 Power LED This LED lights green when power is being received by the MPAII and the POWER switch 6 is ON 6 Power Switch This switch turns ON OFF the MPAII and any equipment con...

Page 9: ...elect The correct baud rate must be set to interface your MPAII with your PC for programming Proper selection of the baud rate is required for correct communication between the MPAII and the PC 4 COM Port Connect this RS232 port to your PC or other programming device 5 Logic Output Connector This connects to any electronic equipment you choose i e cameras signage timers When connected to a camera ...

Page 10: ...te by taking the following factors into consideration Room Planning Before installing your MPAII we recommend that you carefully plan your installation to ensure that you achieve the best possible results Having a basic understanding of room acoustics and conference room design will not only help you install and operate your MPAII but will assist you in the installation and operation of other equi...

Page 11: ...liminate it Gentner s TI7200 Teleconferencing Interface GT300 and GT700 Group Teleconferencers GT724 Group Teleconferencer with simultaneous two wire four wire operation and the G3200 Super Hybrid all perform these functions Each is a telephone interface product designed to electronically eliminate all residual acoustic echo at its source Contact Gentner or your dealer for more information on thes...

Page 12: ...ice pick up pattern audio level and amount of noise introduced into the entire system Typically a unidirectional microphone with a cardioid pattern is the preferred choice for teleconferencing applications Its design allows for maximum pickup from the front of the microphone and minimum pickup from the rear Cardioid microphones are available in several styles including tabletop podium and lavalier...

Page 13: ...nputs minimal switching is required see Step 1 Voltage Input Selection next page PC Option For best performance your PC should have a free COM port and be running on DOS 3 1 or later Auxiliary Equipment Any auxiliary equipment to be used with the MPAII i e echo canceller microphones speakers recording equipment etc should be available at time of installation Equipment Placement The MPAII is design...

Page 14: ... you ready to use with a 120Vac 50 60Hz power source If this suits your MPAII application go to Step 2 PA Connections next page If your application requires a different voltage input follow the procedure below while referring to Figure 8 below Step 1 Unplug the electrical power cable from the rear panel Step 2 Using a small screwdriver remove the cover A from the line voltage module Step 3 Using n...

Page 15: ...ate on Page 13 to change this setting Logic Output Connect the DB15 LOGIC OUTPUT 5 See Figure 12 left open collector to the equipment you need to control This can be a video camera a recorder or some other device you may wish to control through microphone gating Speaker Connect speaker wire between the MPAII s speaker connectors 6 See Figure 13 left and the speakers PA Output PA Input Single MPAII...

Page 16: ...microphones phantom power should be left enabled Go to Step 4 Auto Mix Switches next page If you are using another manufacturer s microphone check their manual or contact the manufacturer to determine if phantom power is required If your microphones do not require phantom power follow the steps below Step 1 Locate the vertically mounted dip switches 10 See Figure 16 above on the MPAII s back panel...

Page 17: ...e the baud rate dip switches 3 See Figure 16 previous page on the MPAII s back panel Step 2 Set the dip switch to the desired baud rate using either the label located above the baud rate select switch Figure 22 left BAUD RATE NOTE If the dip switches are adjusted to change the baud rate the unit will need to be power cycled for the baud rate change to take effect Step 6 Setting Levels Step 1 Put t...

Page 18: ...the factory the MPAII has 12 preset programs six factory defaults which cannot be altered indicated by a green PA LEVEL LED 4 and six customizable programs indicated by a red PA LEVEL LED 4 The six red programs when shipped are identical to the six green programs We recommend trying each of the six green programs in your installation In most cases one of the green programs will be suitable for you...

Page 19: ...eatment has been done to the room When no one is talking all microphones gate OFF reducing feedback potential and ambient noise This program works well in most applications Green 2 This program is designed for a room that has a better acoustic environment than the room described in Green 1 The Last On Mode is ON to keep one microphone active at all times This prevents the ambient noise pumping eff...

Page 20: ...veral people are speaking simultaneously Green 6 This program is also designed for harsh conferencing environments The Last On Mode is ON causing one microphone to be on at all times This reduces the apparent pumping sound when loud ambient noises are present The maximum number of microphones is set at three which allows only three microphones on at a time This helps minimize echo and reverberatio...

Page 21: ...cumentation that came with your PC s operating system for information on creating a directory and copying files to it Running the MPAII Programmming Software From the Hard Drive Unless you added the name of the MPAII directory to your AUTOEXEC BAT file you will need to launch the program from your MPAII directory From the DOS prompt type CD followed by the name of the directory in which you have c...

Page 22: ...pace key will allow you to change values within highlighted fields Understanding the Main Screen The MPAII uses two types of data files configuration files and program files A configuration file is made up of six program files The six program files are listed in columns beneath the headings Red 1 through Red 6 When you load a configuration file the six program files associated with the configurati...

Page 23: ...ptions of the function key actions Online Help F1 Press F1 to bring up an online help screen on the highlighted parameter The online help screen gives a brief description of the highlighted parameter what it does the range of values and recommended settings After you are finished reading the help screen press any key to return to the main menu Select Program F2 Press F2 to bring up the program sel...

Page 24: ...figuration programs are sent to the MPAII at one time To send the configuration programs press F7 The MPAII front panel LEDs will flash indicating that the MPAII is receiving the programs A window will pop up showing the information being sent to the MPAII After all programs have been sent the LEDs will stop flashing and the computer screen returns to the main menu Receive from MPAII F8 Press F8 i...

Page 25: ...t only if the adaptive ambient mode is OFF Best results are usually achieved when the adaptive ambient mode is ON However if you need to set the ambient level to a fixed value turn OFF the adaptive ambient mode The ambient level is measured in dBm and ranges from 105dBm to 39dBm You can empirically find the ambient level by following the steps below Step 1 Set the gate ratio to zero write down the...

Page 26: ... this setting be left ON When turned off usually two or more microphones gate on when only one person speaks However when this parameter is turned on one person will usually be able to gate on only one microphone It does this by determining the audio level received by all microphones when the first microphone is gated on This audio level is then used as the ambient level for all other microphones ...

Page 27: ...If first mic priority mode is active then the recommended maximum number of microphones is eight If first mic priority mode is OFF you may need to reduce the maximum number of microphones to a lower value Off Attenuation This sets the amount of level reduction applied to a microphone when it is not on Figure 30 below The lower the value the closer the audio is to being natural However low values a...

Page 28: ...W x 1 75 4 45cmH x 11 27 9cmD Weight 12 lbs 5 4 kg dry 15 lbs 6 8 kg shipping Connectors POWER Fused multipkle voltage module selectable COM PORT RS232 75 9 600 baud selectable LOGIC OUTPUT DB15 male Eight channels open collector 40Vmax 400mA each AUX INPUT Phono 10dBu nominal adjustable 10Kohms unbalanced AUX INPUT Phono 10dBu nominal adjustable 1Kohms unbalanced MASTER OUTPUT 3 pin male XLR 4dBm...

Page 29: ...hms balanced Power Requirements 100 120 220 240Vac switchable 50 60Hz Audio Performance Mic Mixer Frequency Response 20Hz to 20kHz 1dB Signal to Noise Ratio 60dB ref 55dBu input 4dBm output Total Harmonic Distortion 1 percent Audio Performance Power Amp Frequency Response 1dB 50Hz 20kHz 3dB 20Hz 20kHz Signal to Noise Ratio 80dB ref 4dBm input 15W into 8ohms output Total Harmonic Distortion 0 1 per...

Page 30: ...E APPLIES TO THE EQUIPMENT nor is any person or company authorized to assume any warranty for the Manufacturer or any other liability in connection with the sale of the Manufacturer s products Manufacturer does not assume any responsibility for consequential damages expenses or loss of revenue or property inconvenience or interruption in operation experienced by the customer due to a malfunction i...

Page 31: ...f the noise floor when multiple people are speaking and minimizes the chance of feedback because of the increased gain of having more than one microphone on Decay Time This time determines how fast the microphones are reduced to the off attenuation level from the on level Filibuster This limits the number of microphones allowed to be on simultaneously This helps to reduce confusion when several pe...

Page 32: ... ambient noise and reverberation are reduced enough to minimize the impact of the overall sound quality When all microphones are left on they are extremely sensitive to all sounds in the room Using a non gating microphone mixer also helps stabilize the overall audio in the system because audio is not being turned on and off as in a gating mixer If the environment is treated to eliminate reverberat...

Page 33: ...rams built into it six factory default programs that cannot be changed Green 1 6 and six customizable programs Red 1 6 Most have found that one of the default programs provide excellent results but in rare occasions differing parameters are required These parameters can be programmed into the MPAII as illustrated in this tutorial The red programs come with factory settings identical to the green s...

Page 34: ... as well as from parameter to parameter until you get a feel for it It is important that you know how to get to the configuration names as well as to each of the program names You may also use the Tab and Shift Tab keys to move around on the screen To change a program parameter use the Space Bar and Backspace keys You may also use the number keypad where number values are assigned to a parameter t...

Page 35: ...at the same time This will place you in a program files menu screen Step 3 Using the cursor select THREE and press ENTER This replaces the TUTOR program screen with the THREE program screen Press F6 to load the program The program is now back to the original THREE you began with If you already know the name of the program file you wish to load there is a short cut Step 1 Move the cursor to the Red...

Page 36: ...DEFAULT where TUTORIAL used to be the DEFAULT configuration has been selected but if you look over at RED 3 you will notice that TUTOR is still showing under RED 3 Do not be alarmed you have only selected the configuration file you want to load It has not yet been loaded You must press F4 to load the configuration Once F4 has been pressed the original DEFAULT configuration will be loaded and the p...

Page 37: ...g program using the supplied software as follows Step 1 Press F2 to bring up a program selection menu screen PROGRAM SCREEN NOTE This screen deos not tell you what program is currently running That can only be determined by holding in the left program button under the locking front panel Step 2 Use the arrow keys to select the program you want the MPAII use Step 3 Press F10 to return to the main p...

Page 38: ...ogram without saving your changes then restart your configuration program and return to where you left off Fine Tuning With Your PC Using the PC to fine tune your MPAII is fast effective and simple Step 1 Load the configuration you want to start with most likely DEFAULT Step 2 If you are not going to use any existing program names rename all the program names then save them This will ensure that y...

Page 39: ...e MPAII is used at multiple sites and linked through telephone connections each site can program its MPAII to accommodate the type of conference audioconference or videoconference and the size of the conference room The MPAII can be easily programmed to tailor each system to the application The program allows you to specify adaptive ambient mode ambient level dBu constant gain mode decay rate firs...

Page 40: ...ws can be conducted over the radio broadcast by television or maintained locally within a meeting area Sometimes talk shows are conducted at two or more locations and linked together by telephone However you do it the MPAII will handle the microphone portion of the show Other Gentner products such as the TI7200 Telephone Interface GT300 Group Teleconferencer GT700 Group Teleconferencer GT724 Group...

Page 41: ...Hybrid This unique combination allows the lecturer full control when taking incoming calls from the various distant locations The caller audio is easily transmitted back to all participants at all locations allowing them full interactive communication for the entire lecture Because of room environments speakers and microphones your application may require echo cancellation For help determining if ...

Page 42: ...r information contact Gentner Communications Convention Centers and Hotel Meeting Rooms Gentner equipment supports meetings set up for panel discussions in conference centers and hotels This type of meeting requires a different setup than that of a business meeting or distance learning application The MPAII in this application provides up to eight microphones with the power and amplification neces...

Page 43: ... Houses of Worship This application can be challenging not because it is difficult but because it can incorporate so many microphone location variables and in some cases cause the technician to work around some interesting acoustical environments Figure 39 below illustrates a typical installation and details the acoustical solutions that were presented and solved with use of the MPAII Figure 39 MP...

Page 44: ...Page 40 MPAII Installation and Operations Manual Technical or Setup Assistance Telephone 800 945 7730 USA or 801 975 7200 worldwide Worldwide Web http www gentner com Appendix E MPAII Block Diagram ...

Page 45: ...MPAII Installation and Operations Manual Page 41 Technical or Setup Assistance Telephone 800 945 7730 USA or 801 975 7200 worldwide Worldwide Web http www gentner com Appendix F MPAII Schematics ...

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Page 63: ... Our vision is to provide our customers with the total audio solution for conferencing ...

Page 64: ...les and Technical Assistance 1825 Research Way Salt Lake City Utah 84119 Toll Free 800 945 7730 Telephone 801 975 7200 FAX 801 977 0087 FAX On Demand 800 695 8110 Worldwide Web Page http www gentner com Gentner Part No 800 111 001 Rev 2 00 ...

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